Added closing of port 8090 after nginx configuration done

iSpy-Surveillance/README.md

@@ -89,5 +89,5 @@ LISTEN      0           500                    0.0.0.0:opsmessaging
 systemctl enable nginx --now
 ```
 
-**You now have a basic working iSpy/AgentDVR installation accessible via http://yourserver**
+**You now have a basic working iSpy/AgentDVR installation accessible via http://yourserver** (if you had opened up port 8090 close it, as it should not be used to access your server)